Extension plug for electric sockets



May 28, 1929. c. J. MEDER EXTENSION PLUG FOR ELECTRIC SOCKETS Filed June11, 1926 Patented May 2a, 1929.

was s ns 1 CARL J. Mannie, 0F PHILADELPHIA, PENN YLVANIA Exrnnsron PLUGron ELECTRIC socxnrs'.

Application filed June 11,.

iThe invention relates to improvements inextensions for electric lightsockets as described in the present specification and shown in theaccompanying drawings which forma part of the same.

The object of theinvention is to provide a connecting device, moreparticularly for domestic use, whereby push plugs of cords extendingfrom electrical appliances be. readily attached to an ordinary lightsocket without having to remove its shade in order to comfortably effectsuch connection. With this object primarily in view, a further purposeof the invention is to provide a device of this class which will beeconomical in construction and efficient in its use.

Whereas in the connecting of modern electrical appliances with anordinary light socket, on account of the small space available withinthe light shade not conveniently permitting of the insertion of apersons hand for the purpose of screwing the connection in place in thesocket, the present invention consists of an elongated insulative memberof sufficient length that same may be connected without either removalof the light shade or cramping of the hand of the party effecting suchconnection. The said insulative member bears a threaded'end for thepurpose of screwing into the light socket, its other end being providedwith'a rounded, non-detachable portion through which projects theelectric conductor of cord so that in attaching or detaching theextension plug the hands of the operator cannot accidently come incontact with live wires or exposed metal parts which mightresult inshocks. Also this structure precludes twisting of the-electric cord. Inother words, a relatively large, lower plug portion of insulatingmaterial is provided for the extension plug instead of detachable socketorpush plug members as commonly employed.

With these and other objects in view the invention consists of the novelconstruction hereinafter described and finally claimed.

The nature, characteristic features and scope of the invention will bemore fully understood from the following description taken in connectionwith the accompanying drawings forming part hereof, and in which:

Fig. l-is a View in side elevation of an extension plug in whichtwisting of the elec- 1926). Serial No.'1l15,214.

tric cord iseliminated and a relatively large insulated hand portionprovided.

Fig. 215 a-view in section thereof. Fig. 3 is a view in elevation ofaslightly different form; and 5 v i Fig. 4 is a view illustratinganelectric light fixture and shade illustrating the manner of attachingan extension plug, the plug in this instance being of still further'modi For the purpose of illustrating my invention I have shown. in theaccompanying drawings several forms thereof which are at presentpreferred ,by me, since the same have been found in practice to givesatisfactory and reliable results, although it is to be understood thatthe various instrumcntalities of which my invention consists can bevariously arranged and organized and that my invention is not limited tothe precise arrangement and organization of the instrumentalities asherein shown and described.

Referring now to the drawings in detail and with especial relation firstto Figs; 1 and 2, the reference numeral 1 designates an integral, outercylindrical and elongated hand gripping portion or casing made of in-'sulating material. The outer end is generally rounded at 2 and has acentral. bore 3 entirely therethrough. Extended through this casing is acore 4 of insulating material the outer end of which projects from thecasing and the inner end of which carries a porcelain member 8 providedwith electrical terminals. A screw-threaded, metallic ring designated 5,which surrounds member 8, and the casing 1 are fixed by means of pins 6.Passing through the core 4 and connect-- ing with the terminals ascarried by the core 4 is the electrical cord 7. Thus the core 4,porcelain member and cord may remain fixed or stationary whilethe casing1 and ring 5 are being secured to an electric socket. Also the casing 1has no exposed contacts or metal parts at its end 2 and has an elongatedinsulated hand grip so that no danger of electrical shock may beexperienced in lating material and is of sufiicient length to permit aperson to grasp the same with out danger of shock as is oftenexperienced in the small, cap-like parts carrying socket engagingcontacts. The inner casing part is designated 11 and is provided at itsouter end with a part arranged to receive the contacts 10, is elongatedand terminates in a" screw-threaded part 12 for engaging a socket. Thepart 13 of casing 9 is generally rounded and has no exposed metallicparts.

Y screw-threaded with an electrical fixture or.

llke socket 16.

Thus, in this instance, as well as in those previouslydescribed, theoperator does not run the risk of electrical shock in attaching orremoving said exten sion socket because of the very long casing part 14,Thus, any one of the three deed pin-for securing said sleeve tosaid.

casing, a screw-threaded socket engaging ring interlocked by saidsleeve, a threaded hollow metallic thimble to which oneof the wires ofan electrical conductor is secured, a core of insulating material withinsaid casing through which passes said electrical conductor, said corehaving a shoulder, a metal ferrule abutting upon said shoulder, the plugand its ring being capable of being rotated without rotation of saidcore and its cord, said core abutting against the inner wall of saidcasing throughout the major portion of its extent.

In. testimony whereof, I have hereunto signed my name. CARL J. MEDER.

